:root {
  color-scheme: dark;
  --c-surface: #101113;
  --c-panel: #18191c;
  --c-border: #343538;
  --c-muted: #a9a59b;
  --c-ink: #e9e7df;
  --c-ink-strong: #eee9dd;
  --c-ink-soft: #cfcac0;
  --c-ai: #8eb8c8;
  --c-logo: #8eb8c8;
  --c-body-bg: #101113;
  --c-radial: rgba(142, 184, 200, 0.07);
  --c-grid: rgba(233, 231, 223, 0.014);
  --c-grid2: rgba(142, 184, 200, 0.02);
  --c-weave: rgba(233, 231, 223, 0.01);
  --c-shadow: rgba(0, 0, 0, 0.4);
  --c-hover: rgba(233, 231, 223, 0.05);
  --font-sans: 'Geist', system-ui, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, monospace;
}

[data-theme="light"],
:root.light {
  color-scheme: light;
  --c-surface: #edeff2;
  --c-panel: #ffffff;
  --c-border: #dde1e7;
  --c-muted: #6b7280;
  --c-ink: #1c2027;
  --c-ink-strong: #0a0c10;
  --c-ink-soft: #454b57;
  --c-ai: #4a7380;
  --c-logo: #4a7380;
  --c-body-bg: #edeff2;
  --c-radial: rgba(74, 115, 128, 0.06);
  --c-grid: rgba(28, 32, 39, 0.028);
  --c-grid2: rgba(74, 115, 128, 0.03);
  --c-weave: rgba(255, 255, 255, 0.4);
  --c-shadow: rgba(20, 24, 32, 0.1);
  --c-hover: rgba(28, 32, 39, 0.045);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* ---------- Scrollbar ---------- */

* {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--c-ai) 32%, transparent) transparent;
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--c-ai) 28%, transparent);
  border-radius: 1rem;
  border: 3px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--c-ai) 48%, transparent);
  background-clip: padding-box;
}
::-webkit-scrollbar-corner { background: transparent; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--c-ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  background-color: var(--c-body-bg);
  background-image:
    radial-gradient(ellipse at 22% 12%, var(--c-radial), transparent 42%),
    radial-gradient(ellipse at 82% 86%, var(--c-radial), transparent 44%),
    linear-gradient(var(--c-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-grid2) 1px, transparent 1px),
    repeating-linear-gradient(135deg, var(--c-weave) 0 1px, transparent 1px 8px);
  background-size: auto, auto, 56px 56px, 56px 56px, 12px 12px;
}

/* ---------- Nav ---------- */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 64px;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--c-border);
  background: color-mix(in srgb, var(--c-body-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--c-ink-strong);
  text-decoration: none;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  font-weight: 600;
}

.palm {
  width: 1.15rem;
  height: 1.15rem;
  color: var(--c-logo);
  flex-shrink: 0;
}

.nav-actions {
  display: inline-flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  color: var(--c-muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 450;
  transition: color 140ms ease;
}

.nav-link:hover { color: var(--c-ink-strong); }

.nav-cta {
  color: var(--c-ink-strong);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: 1px solid var(--c-border);
  border-radius: 0.3rem;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.nav-cta:hover {
  border-color: color-mix(in srgb, var(--c-ai) 45%, var(--c-border));
  background: color-mix(in srgb, var(--c-ai) 8%, transparent);
}

.nav-theme {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: 0.25rem;
  background: transparent;
  color: var(--c-muted);
  cursor: pointer;
}

.nav-theme:hover {
  background: color-mix(in srgb, var(--c-ink) 5%, transparent);
  color: var(--c-ink);
}

.theme-icon { display: none; }
:root:not([data-theme="light"]):not(.light) .theme-icon-sun { display: block; }
[data-theme="light"] .theme-icon-moon,
:root.light .theme-icon-moon { display: block; }

/* ---------- Layout ---------- */

.section-inner {
  width: min(72rem, 100%);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2.5rem);
}

main { display: block; }

/* ---------- Buttons ---------- */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid color-mix(in srgb, var(--c-ai) 65%, var(--c-border));
  border-radius: 0.3rem;
  background: var(--c-ai);
  color: var(--c-panel);
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  transition: filter 140ms ease;
}

.btn-primary:hover { filter: brightness(1.06); }

.btn-large {
  padding: 0.9rem 2rem;
  font-size: 0.92rem;
}

.btn-ghost {
  color: var(--c-ai);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 550;
  border-bottom: 1px solid color-mix(in srgb, var(--c-ai) 40%, transparent);
  padding-bottom: 1px;
  transition: color 140ms ease, border-color 140ms ease;
}

.btn-ghost:hover {
  color: var(--c-ink-strong);
  border-color: var(--c-ai);
}

/* ---------- Section title ---------- */

.section-kicker {
  margin: 0 0 0.75rem;
  color: var(--c-ai);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-title {
  margin: 0 0 2.5rem;
  color: var(--c-ink-strong);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 660;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

/* ---------- Hero ---------- */

.hero {
  padding: clamp(3rem, 9vh, 5.5rem) 0 clamp(3rem, 8vh, 5rem);
}

.hero-grid {
  width: min(72rem, 100%);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2.5rem);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-kicker {
  margin: 0;
  color: var(--c-ai);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;
  color: var(--c-ink-strong);
  font-size: clamp(2.4rem, 5.5vw, 3.6rem);
  font-weight: 680;
  letter-spacing: -0.045em;
  line-height: 1.02;
  text-wrap: balance;
}

.hero-btc {
  display: inline-flex;
  align-items: baseline;
  gap: 0.28em;
  white-space: nowrap;
  vertical-align: baseline;
}

.hero-btc-mark {
  width: 0.82em;
  height: 0.82em;
  flex: 0 0 auto;
  align-self: center;
  transform: translateY(0.04em);
}

.hero-sub-block {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  max-width: 34rem;
}

.hero-sub {
  margin: 0;
  color: var(--c-ink-soft);
  font-size: 1.12rem;
  font-weight: 450;
  letter-spacing: -0.015em;
  line-height: 1.5;
}

.hero-sub-mech {
  margin: 0;
  color: var(--c-muted);
  font-size: 0.98rem;
  font-weight: 450;
  letter-spacing: -0.01em;
  line-height: 1.5;
}

.hero-sub-emph {
  margin: 0;
  color: var(--c-ink-strong);
  font-size: 1.05rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  line-height: 1.45;
}

.hero-sub-emph .hero-emph-accent {
  color: var(--c-ai);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

/* ---------- Hero mock ---------- */

.hero-visual {
  display: flex;
  justify-content: center;
}

.mock {
  width: 100%;
  max-width: 26rem;
  border: 1px solid var(--c-border);
  border-radius: 0.6rem;
  background: var(--c-panel);
  box-shadow: 0 24px 60px -20px var(--c-shadow);
  overflow: hidden;
}

.mock-head {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--c-border);
  background: color-mix(in srgb, var(--c-surface) 70%, var(--c-panel));
}

.mock-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--c-border);
}

.mock-url {
  margin-left: 0.6rem;
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.mock-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  padding: 1.5rem;
  align-items: center;
}

.mock-qr {
  color: var(--c-ink-strong);
  aspect-ratio: 1;
  width: 100%;
}

.mock-qr svg { width: 100%; height: 100%; display: block; }

.mock-meta {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.mock-row {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.mock-label {
  color: var(--c-muted);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mock-val {
  color: var(--c-ink-strong);
  font-size: 0.92rem;
  font-weight: 600;
}

.mock-val.mono { font-family: var(--font-mono); font-size: 0.82rem; }

.mock-status {
  margin-top: 0.4rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--c-ai);
  font-size: 0.78rem;
  font-weight: 550;
}

.mock-pulse {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--c-ai);
  box-shadow: 0 0 0 0 var(--c-ai);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--c-ai) 60%, transparent); }
  70% { box-shadow: 0 0 0 0.5rem transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* ---------- How it works ---------- */

.how {
  padding: clamp(3rem, 8vh, 5rem) 0;
  border-top: 1px solid var(--c-border);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.step {
  padding: 1.75rem 1.5rem 1.75rem 0;
  border-top: 1px solid color-mix(in srgb, var(--c-ai) 30%, var(--c-border));
  position: relative;
}

.step-num {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.22rem 0.5rem;
  border: 1px solid color-mix(in srgb, var(--c-ai) 45%, var(--c-border));
  border-radius: 0.2rem;
  background: var(--c-surface);
  color: var(--c-ai);
  font-family: var(--font-sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
}

.step h3 {
  margin: 0 0 0.5rem;
  color: var(--c-ink-strong);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.step p {
  margin: 0;
  color: var(--c-ink-soft);
  font-size: 1rem;
  line-height: 1.5;
}

.step code {
  font-family: var(--font-mono);
  color: var(--c-ai);
  font-size: 0.86em;
  padding: 0.1rem 0.3rem;
  border-radius: 0.18rem;
  background: color-mix(in srgb, var(--c-ai) 8%, transparent);
}

/* ---------- Self-custody ---------- */

.custody {
  padding: clamp(3rem, 8vh, 5rem) 0;
  border-top: 1px solid var(--c-border);
}

.custody-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.custody-title {
  margin: 0 0 1.5rem;
  color: var(--c-ink-strong);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 660;
  letter-spacing: -0.035em;
  line-height: 1.1;
  text-wrap: balance;
}

.custody-body {
  margin: 0;
  color: var(--c-ink-soft);
  font-size: 1.05rem;
  line-height: 1.55;
  max-width: 30rem;
}

.custody-body code {
  font-family: var(--font-mono);
  color: var(--c-ai);
  font-size: 0.86em;
}

.custody-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.custody-facts li {
  display: grid;
  grid-template-columns: 1.75rem 1fr;
  gap: 0.85rem;
  align-items: start;
  color: var(--c-ink-soft);
  font-size: 1rem;
  line-height: 1.5;
}

.custody-facts strong {
  color: var(--c-ink-strong);
  font-weight: 600;
}

.fact-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--c-ai) 14%, transparent);
  color: var(--c-ai);
  font-size: 0.8rem;
  font-weight: 700;
}

/* ---------- Pricing ---------- */

.pricing {
  padding: clamp(3rem, 8vh, 5rem) 0;
  border-top: 1px solid var(--c-border);
}

.pricing .section-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.price-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 22rem));
  gap: 1.5rem;
  justify-content: center;
  width: 100%;
}

.price-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  border: 1px solid color-mix(in srgb, var(--c-ai) 35%, var(--c-border));
  border-radius: 0.4rem;
  background:
    radial-gradient(100% 60% at 100% 0%, color-mix(in srgb, var(--c-ai) 8%, transparent), transparent 50%),
    var(--c-panel);
}

.price-card--featured {
  border-color: color-mix(in srgb, var(--c-ai) 55%, var(--c-border));
  background:
    radial-gradient(100% 60% at 100% 0%, color-mix(in srgb, var(--c-ai) 12%, transparent), transparent 55%),
    var(--c-panel);
  box-shadow: 0 18px 48px -24px color-mix(in srgb, var(--c-ai) 40%, transparent);
}

.price-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
  justify-content: center;
}

.btc-mark {
  width: 1.3rem;
  height: 1.3rem;
  flex: 0 0 auto;
  align-self: center;
}

.price-amt {
  color: var(--c-ink-strong);
  font-size: 2.4rem;
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1;
}

.price-unit {
  color: var(--c-muted);
  font-size: 0.92rem;
}

.price-note {
  margin: 0.5rem 0 1.5rem;
  color: var(--c-ai);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.price-facts {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  text-align: left;
}

.price-facts li {
  color: var(--c-ink-soft);
  font-size: 0.95rem;
  padding-left: 1.4rem;
  position: relative;
}

.price-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--c-ai);
}

.price-cta { width: 100%; }

/* ---------- Final CTA ---------- */

.final-cta {
  padding: clamp(4rem, 10vh, 6rem) 0;
  border-top: 1px solid var(--c-border);
  text-align: center;
}

.final-title {
  margin: 0 0 1rem;
  color: var(--c-ink-strong);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1.05;
  text-wrap: balance;
}

.final-sub {
  margin: 0 0 2rem;
  color: var(--c-ink-soft);
  font-size: 1.1rem;
  line-height: 1.5;
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--c-border);
  padding: 2.5rem 0 3rem;
}

.footer-inner {
  width: min(72rem, 100%);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2.5rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--c-ink-strong);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.footer-copy {
  margin: 0;
  color: var(--c-muted);
  font-size: 0.84rem;
  line-height: 1.45;
  max-width: 28rem;
}

.footer-links {
  display: inline-flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--c-muted);
  text-decoration: none;
  font-size: 0.82rem;
  transition: color 140ms ease;
}

.footer-links a:hover { color: var(--c-ink-strong); }

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-visual { order: -1; }
  .steps { grid-template-columns: 1fr; }
  .custody-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-link { display: none; }
  .nav-actions { gap: 0.75rem; }
  .mock-body { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr; }
  .price-card { min-width: 100%; }
}